Objective corrected spherically, chromatically, astigmatically, and for coma



Dea 3o, 1930.

ASTIGMATICALLY, AND FOR COMA 'iff' 164L66'- fca/ lang/#400' 8 41232.?46! Y 'car/V /engmf Filed Sept. '7,

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Patented Dec. 30, 1930 UNITED STATES PATENT OFFICE WILLY MERTE, OF JENA,GERMANY, ASSIGNOR TO THE FIRM OF CARL ZEISS, OF JENA, I

GERMANY OBJECTIVE CORRECTED SPHERICALLY, CHROMATICALLY, ASTIGMATICALLY,AND FOR COMA Application led September 7, 1928, Serial No. 304,470, andin Germany September 29, 1927.

The present invention relates to photoafter relate to a focal length ofthe objecgraphic objectives consisting of four lenses, tives of 100units.

separated by air, of which the two outer` ones Example 1 (Fig. 1) arecollective and the two inner ones disper- .r sive and d1st1nctlymen1sc1, their concave Rad Thiernesses "0 surfaces facing each other.and dlstans According to the present mventlon 1t 1s possible to obtainobjectives with unusually gij: Sli @i113 large aperture, ail'ordlng theutmost sharpr5=+ 45.35 dn=1ao7 r4=111s.1s dm= 2.22 55 ness andbrllliancy of the images produced, r5=+ 29.10 z2=19.5s by maklngdlstlnctly biconvex that one of 2; '1532253 the two collective lensesfacing the lmage, r= 55.00 1F11. 74 .i Tn=+ 109.69 dv1=11.62 and by sochooslng the proportlon 1n whlch, rw= 68.20 n= 2. 74 1n the othercollective lens, the curvature "F" 124'13 (.0

1" radius of the strongest curved boundary surp.

face stands to the curvature radius of the KINDS 0F GLASS other boundarysurface, that it is algebraical- Lens nd v ly larger than thecorrespondmg proportlon 9 of the collectlve lens faclng the image. I 164238 48 o 65 o AAs d1st1nctly blconvex and distinctly {egg} 5310menlscal one intends to des1gnate 1n this case 1v 1I457S jg such lenseslnwhlch, accordlng to the abso- XI jgg lute amount, the one radius is atmost the VII 1-67292 32.2 centuple of the other. '70

I norder to eliminate certain d eiinlte re- Example 2 (F,g 2) malnlngaberratlons 1n the ob]ect1ves corresponding to the lnventlon a part ofthe four Rad 'rhicignesses lenses or also all four of them may be suband@stances divided lnto several members cemented to g .-5 30 each other.F+ 83's d10'75 2+ 321.0 li- 1.65 In the annexed drawing Figs. l and 2each f=+ 44-8 d11=15-55 n=1150 dm= 5.05 Show an example of the lnventlon1n a longlr5=+ ggg d z2=1g5 tudlnal sectlon. El; 5015 $221122 The twoob]ect1ves shown 1n the drawlng gi; lgj dvlg 80 and further explained inthe subjoined tables r1o= 120.0

are destmed for use at a relative aperture of y 1:1.4. At this largeaperture the spherical KINDS 0E GLASS aberrations of the two objectivesare very l 40 slight. In the objective shown in Fig. 1, e. g. Le n 85Athe maximum of the spherical aberrations I. l 64238 480 for the D: lineonly amounts to one thoun 1152300 5519 sandth of the focal length,whereby the cor' V 1.64238 48.0 rectlon of the obllque penclls 1s earnedout VI 1.64238 4&0 90

415 quite satisfactorily. The values given herelce I claim:

l. Photographic objective corrected spherically, chromatically,astigma-tically and for coma, consisting of four lenses separated bylair, of which the two outer ones are collective, while the two innerones are dispersive and distinctly menisci whose concave surfaces faceeach other, of the two collective lenses the one facing the image beingdistinctly biconvex and the proportion in which, in thev othercollective lens, the curvature radius of the strongest curved boundarysurface stands to the curvature radius of the other boundary surface,being algebraically larger than the corresponding proportion of thecollecting lens facing the image. 'i

2. An objective comprising fourcomponents separated by air spaces, thetwo outer components being collective, the two inner components beingdispersive, each of said inner components comprising two elements, theinner elements of the inner components having concave surfaces whichvface each other and provide an intermediate air lens, said frontcomponent being distinctly meniscus, both the surfaces of said rearcomponent being convex.

3. Photographic objective corrected spherically, chromatically,astigmatically and for coma, consisting of four lenses separated by air,of which the twoouter ones are collective, while the two inner ones aredispersive and distinctly menisci whose concave surfaces face eachother, of the two collective lenses the one facingthe image beingdistinctly biconvex and the other collective lens being a meniscus, theproportion in which, in this collective lens, the curvature radius ofthe strongest curved'boundary surface stands coma, consisting of fourlenses separated byl air, of which the two outer ones are collec*y tive,while the two inner ones are dispersive and distinctly menisci whoseconcave sur-- ture radius of the strongest curved boundary surfacestands to the curvature radius of the other boundary surface, beingalgebraically larger than the corresponding proportion of thecollectinglens facing the image.

6. Photographic objective corrected spherically, chromaticallyastigmatically and for coma, consistingV of: our" lenses separated byair, of which the two o'uter ones are collective, while the two innerones are dispersive and distinctly inenisci whose concave surfaces, faceeach other, of the two collective lenses the one facing the image beingdistinctly biconvex, the refractive indices pertaining .to the D-line ofthe members contained in this lens amounting to at least 1.61, and theproportion in which, in the other collective lens, the Vcurvature radiusof the strongest curved boundary surface stands 4to the curvature radiusof the other boundary surface, being algebraically larger than thecorresponding proportion of the icollecting lens facing the image.

i WILLY MERT.

to the curvature radius of the other boundary surface, beingalgebraically larger than the corresponding proportion of the collectinglens facing the image. v

4. Photographic objective corrected s herically, chromatically,astigmatically an for coma, consisting of four lenses separated by-Vair, of which the two outerones are collective, while the two inner onesare dispersive j and distinctly menisci whose concave surfaces faceeachother, of the two collective lenses the one facing the image beindistinctly biconvex and the curvature radius of the one boundary surfaceof this lens, according to the absolute values, being not larger thantwice the curvature radius of the other boundary line of this lens, theproportion in which, in the other collective lens, thel curvature radiusof the strongest curved boundary surface stands-to the curvature radiusof the other boundary surface, beingy algebraically larger than thecorresponding proportion of thecollecting lens facing the image.

5. Photographic objective corrected spherically, chromatically,astigmatically and forA www" wat

